Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Repair guides›Fill Cooling System

Kohler — Fill Cooling System

For these Kohler models: LH640, LH685/LH690.

Applies to: Kohler LH640

Before you start

  • Hot liquid can cause severe burns. Do not loosen radiator cap while engine is operating or warm to touch.
  • Liquid coolant can get extremely hot from operation. Turning radiator cap when engine is hot can allow steam and scalding liquid to blow out and burn you severely. Shut off machine. Only remove radiator cap when cool enough to touch with bare hands. Slowly turn cap.

Procedure

  1. Check condition of cooling system hoses, clamps, and associated components.
  2. Replace components as required.
  3. Fill with 2.1 U.S. qt. (2.0 L) equal parts of ethylene glycol (anti-freeze) and water only.
  4. Use distilled or deionized water if available, especially in areas where water contains a high mineral content.
  5. Fill radiator with coolant mixture.
  6. Allow coolant to drain into lower areas.
  7. Fill overflow reservoir to a level between FULL and ADD marks.
  8. Reinstall radiator and reservoir caps.
  9. Start and run engine for five minutes.
  10. Stop engine and allow to cool.
  11. Recheck coolant level in reservoir. Coolant level should be between FULL and ADD marks.
  12. Add coolant to reservoir if required.

Specs & torque values

  • Coolant capacity: 2.1 U.S. qt. (2.0 L)
  • Coolant mix: Equal parts ethylene glycol (anti-freeze) and water

Source: manual:66_590_08_EN.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.